Speed comparing device



July 26, 1938. R. B. LEWIS SPEED COMPARING DEVICE Filed Sept. 26, 1933 2Sheets-Sheet l INVENTOR FOSAEWTB. L Err/.5,

July 26, 1938. R. B. LEWIS 1 SPEED COMPARING DEVICE Filed Sept. 26,"1933 2 Sheets-Sheet 2 mar INVENTOB 1%5E/P7'5 LEW/5 ATTORNEY PatentedJuly 26, 1938 2,125,117

UNETED STATES PATENT Oi 'i 'lhE SPEED COMPARING DEVICE Robert B. Lewis,Philadelphia, Pa., assignor to Tinius (Olsen Testing Machine Company,Philadelphia, Pa., a corporation of Pennsylvania Application September26, 1933, Serial No. 690,994

Claims. (Cl. 73-51) The present invention relates to speed comresponsiveto the load applied to the yoke l'l paring devices and more particularlyto an elewhich is connected through the test piece with ment of thischaracter operating in conjunction the load applying cross-head Hi. In atesting with a testing machine to insure a uniform conmachine of thischaracter it is essential that the 5 stant rate of loading. load beapplied uniformly and that its rate of 5 The present application isfiled as a continuaapplication be known. tion in part of applicantsco-pending application, For the purpose of checking and setting theSerial No. 637,394, filed October 12th, 1932, for pointer it so that ittravels at a predetermined Universal testing machine. rate around theface of the dial II a pacer ele- In testing machines of the tension orcommentor speed comparing pointer 29 is attached l0 pression type it isan essential part of every test to a wire 2! of ring form whichencircles a driven that the operator of the machine know the rate chain22 and is held in place between the pairs at which the load is appliedto the specimen under of links 23 in order that it be prevented fromtest, and it is also desirable to be able to check lateral displacement.The length of the wire the rate of loading at any time during thetesting ring 2| is preferably shorter than the length of 15 operation.the chain 22 and its ends are connected by a coil It is one object ofthe present invention to prospring 24 which serves to hold the ring 2|in vide a speed comparing device which is more parfrictional contactwith the chain 22. Obviously ticularly adapted for use in testingmachines, the ring 2! can be of spring material. As here though alsocapable of being used with other shown the chain 22 is arranged totravel in a cir- 20 equipment. It is another object of the invenculartrack 25 formed in the back support of the tion to provide a speedcomparing device which dial II, but at one point in the circumferencecan be readily set to any desired rate of speed the track 25 is brokenaway to'form a path beand which when initially set will maintain thattween two guide or idle rolls 26 and ll for the 25 selected speed.Another object of the invention passage of the endless chain 22 so thatsaid chain 25 is to provide a simple, efficient, variable speed can passarounda driven sprocket wheel 28. This control for a speed comparingdevice, whereby sprocket wheel 28 is fast to a shaft 39 which carany oneof a number of speeds can be selected at ries a disc 3! arranged to befrictionally driven will. It is a further object of the invention to bya fric ion wheel 32 keyed to a lon itudinall provide means whereby adefinite constant loadshiftable shaft 33. The shaft 33 is mounted in 39ing rate of a testing machine can be maintained; suitable bearings 34and the speed of rotation and to provide other improvements as willhereof the disc 3| is determined by the position of the inafter appear,wheel 32 with respect to the axis of the disc 3|.

In the accompanying drawings Fig. 1 represents As here shown, the shaft33 carries a gear 35 35 a side elevation of a portion of a testingmachine which is keyed thereon and meshes with a relaequipped with aspeed comparing device erntively long gear 36 in order to maintain themeshbodying one form of the present invention; Fig. 2 in r lat n f y p rv p i i n f the represents an end elevation of the same; Fig. 3 shaft33. The gear 36 is keyed to a shaft 31 represents a detail in planbroken away to show which is driven by a gear 33 in mosh W th the thedriving mechanism for the speed comparing Pinion O a Constant pe11101501 The gear 40 device; Fig. 4 represents a detail of one form oftrain 35 to 40 inclusive provides a suitable recarrier for the speedindicator; Fig. 5 represents duction from the constant speed motor 4| aswill on a larger scale a detail of the carrier mounting; be understood.Preferably the end of the shaft and Fig. 6 represents a section on line66 of 33 Which p j s through the Casing 42 s ad- Fig. 5. uated in termsof track speed as shown at 43 45 Referring to the drawings one form ofthe in order to correspond to the rate of load applied present inventionis shown as used with a testto the specimen in the machine so that theshaft ing machine to serve as a pacer or speed comparcan be pushed in orout as the case may be to ing means for the pointer l9 which rotatesabout fix the predetermined loading rate.

the face of a dial ll when driven by a spindle [2. In assembling thespeed comparing device of 50 In the present machine the spindle I2 isdriven the present invention the endless chain 22 is by a gear H5 inmesh with a reciprocable rack 14 brought around the sprocket 28 and overthe two which is responsive to an arm l5 controlled by idler rolls 26and 2'! and passed around the cirthe action of a weighing system of thependulum cumference of the indicating device to seat in type. The beam!6 of the weighing system is the groove 25 at the back of the dial II.The 55 ring or pacer element 2| is then stretched to encircle the chain22 and when properly located it is released so that the spring 24 causesthe ring 2| to seat between the chain links all the way around thecircumference and hold it gripped so that it travels with the chain atthe predetermined rate without slippage. The ring 2! being asubstantially continuous band about the chain 22 bridges the spacebetween the rollers 26 and 21 so that the pointer 20 is free to make asmany revolutions as may be required.

While only a single form is shown in which this invention may beembodied, it is to be understood that the invention is not limited toany specific construction, but might be applied to various forms withoutdeparting from the spirit of the invention or the scope of the appendedclaims.

Having thus described my invention, I claim:

1. A speed comparing device comprising a circular track, a flexiblemember arranged to ride on said track, means to drive said member at apredetermined speed, a ring frictionally held upon said member, and apointer attached to said ring for indicating the movement of saidmember.

2. A speed comparing device comprising a body forming a circularperipheral track having an opening to the interior of said body, a wheelrotatably mounted in said body opposite said opening, a continuousmember mounted to ride on said track and having a loop passing throughsaid opening and encircling said wheel, a ring clamped upon said memberto be driven frictionally thereby, means to drive said wheel to causesaid member to travel around said track, and means on said ring forindicating the speed of said member.

3. A speed comparing device comprising a body forming a circularperipheral track having an opening to the interior of said body, a wheelrotatably mounted in said body opposite said opening, a continuousmember mounted to ride on said track and having a loop passing throughsaid opening and encircling said wheel, a ring having a spring stretchedin its length to clamp said ring to said member for friction drivepurposes, means to drive said wheel to cause said member to travelaround said track, and means on said ring for indicating the speed ofsaid member.

4. A speed comparing device comprising a ring provided with a pointer,means for supporting and frictionally driving said ring, and means forrotating said supporting means.

5. A speed comparing device comprising a ring provided with a pointer,means including a chain for supporting and frictionally driving saidring, said chain having an inwardly disposed loop, and means coactingwith said loop for rotating said chain.

ROBERT B. LEWIS.

